Charlie23
I would respectfully suggest that telling NATS HR where you will and won't work may not be the most sensible addition to any job application. NATS ATCO's are a mobile grade and should be prepared to go anywhere.
There are of course exceptions:
1. If you moan a lot
2. Friends in the right places
3. Spouse/partner preferential treatment
4. Management potential rising star
5. Compassionate reasons
It may be wise to get the job before laying down your posting requirements.
If your shorlist is only Manch/Brum then I wouldn't hold your breath!
Good luck anyway.